[Hypoglossal nerve stimulation in patients with CPAP failure : Evolution of an alternative treatment for patients with obstructive sleep apnea].

Obstructive sleep apnea (OSA) is a common disease in western industrialized countries with increasing prevalence. Gold standard of therapy is nocturnal positive pressure ventilation by continuous positive airway pressure (CPAP). Due to complications and side effects of ventilation, therapy adherence is limited. Recently an alternative surgical treatment has become available for these patients, which uses established techniques to stimulate the hypoglossus nerve to open the upper airway during sleep. The aim of this work is to provide an overview of the history and current state of scientific knowledge of this therapy in the treatment of OSA. Currently, two systems are available on the market: respiratory-driven hypoglossal nerve stimulation (Inspire Medical Systems) and continuous hypoglossal nerve stimulation (ImThera Medical). For respiratory-driven hypoglossal nerve stimulation, a solid body of evidence is available and the therapy has been investigated in numerous multicenter clinical studies with regard to safety and efficacy. Only a small number of publications is available for continuous hypoglossal nerve stimulation. At the end of the last century, promising clinical results were shown in the first patients treated with hypoglossal nerve stimulation. Consequent technological and scientific development of respiratory-driven hypoglossal nerve stimulation in recent years led to its implementation in today's clinical routine. This therapy significantly broadens the spectrum of therapies in the treatment of OSA, especially for patients with CPAP intolerance.